Table 2: Rates of emergency department visits and regression results for predictors of emergency department visits.
| Variable | No. of visits | Person-years | No. of visits per 100 person-years (95% CI) | Unadjusted rate ratio (95% CI) | Adjusted* rate ratio (95% CI) |
|---|---|---|---|---|---|
| HIV status | |||||
| Non-HIV | 17 967 | 57 672.8 | 31.2 (29.9-32.5) | 1.00 | 1.00 |
| HIV | 9670 | 14 370.0 | 67.3 (63.6-71.2) | 2.19 (2.10-2.30) | 1.58 (1.51-1.65) |
| Neighbourhood income quintile | |||||
| 5 (highest) | 3987 | 13 224.6 | 30.1 (28.3-32.1) | 1.00 | 1.00 |
| 4 | 3933 | 12 101.2 | 32.5 (30.7-34.4) | 1.05 (0.98-1.13) | 1.06 (0.99-1.13) |
| 3 | 4978 | 12 798.6 | 38.9 (36.3-41.7) | 1.27 (1.19-1.36) | 1.21 (1.14-1.29) |
| 2 | 5977 | 15 274.5 | 39.1 (36.9-41.5) | 1.30 (1.21-1.38) | 1.23 (1.16-1.31) |
| 1 (lowest) | 8484 | 18 015.8 | 47.1 (43.5-50.9) | 1.55 (1.45-1.65) | 1.35 (1.27-1.43) |
| Residence | |||||
| Urban | 25 208 | 68 225.9 | 36.9 (35.6-38.3) | 1.00 | 1.00 |
| Rural | 2337 | 3504.2 | 66.7 (60.7-73.3) | 1.49 (1.35-1.64) | 1.71 (1.61-1.91) |
| No. primary care visits in the past year | |||||
| 0 | 4309 | 18 544.3 | 23.2 (21.6-25) | 1.00 | 1.00 |
| 1-2 | 5762 | 19 538.4 | 29.5 (27.7-31.4) | 1.27 (1.20-1.35) | 1.27 (1.20-1.34) |
| ≥ 3 | 17 566 | 33 960.1 | 51.7 (49.4-54.1) | 2.30 (2.19-2.42) | 1.47 (1.40-1.55) |
| Aggregated diagnosis groups(prior year) | |||||
| 0-5 | 16 263 | 60 123.7 | 27.0 (26.0-28.2) | 1.00 | 1.00 |
| 6-9 | 7416 | 9979.9 | 74.3 (69.9-79.0) | 2.79 (2.66-7.49) | 2.29 (2.17-2.41) |
| ≥ 10 | 3958 | 1939.2 | 204 (184.1-226.3) | 8.22 (7.49-9.03) | 6.16 (5.60-6.76) |
Note: CI = confidence interval.
*Adjusted for HIV status, neighbourhood income quintile, urban versus rural residence, number of primary care visits in the past year and comorbidity burden in the past year.